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Officially, the definition of a meter is the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second. Therefore, the official definition of a kilometer is ten times that distance, which happens to be 1,000 meters. For a real world comparison, imagine Central Park in New York City. It is 849 meters wide — just short of a kilometer — and approximately 4 kilometers long.